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folloup to color question

Posted on 1998-06-09
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Last Modified: 2013-11-20
I changed the background in my view in the OnPrepareDC function.This is the code I use:
CBrush Br(RGB(0,0,0));
CRect rcBounds;
 pDC->GetClipBox(&rcBounds);
 CBrush* pOldBrush = pDC->SelectObject(&Br);
 pDC->PatBlt(rcBounds.left, rcBounds.top, rcBounds.Width(), rcBounds.Height(),PATCOPY);
 pDC->SelectObject(pOldBrush);
COLORREF crBk = pDC->GetBkColor();
pDC->SetBkColor(RGB(0,0,0));
COLORREF crTxt = pDC->GetTextColor();
pDC->SetTextColor(RGB(255,0,0));

The problem is when I scroll, I see white flashes come across the screen, as if the view is being redrawn in white, before being drawn as black. Any idea what this may be? Where is it being drawn in white?

Thanks
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Question by:smithc
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Tommy Hui earned 50 total points
ID: 1317806
The answer to that is WM_ERASEBACKGND and your class has a default brush. Your best bet is to use a memory DC to do your drawing and to then make the copy to the screen. This elminates all flashes.
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Author Comment

by:smithc
ID: 1317807
thanks
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